BNC 577 - Manual (Page 39)

Model 577 Operating Manual 33
12 Option AT45 (45V Output)
For channels with AT45 output option, the maximum frequency is limited to 100 KHz. The pulse width can be set
over the standard range of the unit with both active high and low outputs when set to high impedance mode. In
low impedance mode, the pulse width is limited to a maximum of 10s and the active low output is no longer
allowed. To maintain the highest possible rise time, care must be taken with cabling and termination. Low
capacitance cable and 50
Ω termination will provide the fastest rise times without overshoot. Additional
commands now available in the Command Line interface are described in the table below. The channel menu
structure for the AT45 module changes as follows:
1. When in the output menu for an AT45 module there is now a soft key for HiZ and LoZ modes that
replaces the Adjustable vs TTL modes.
2. Outputs amplitudes can now be set from 4-45 volts.
12.1 AT45 Protection Error Messages
When an AT45 module is present, the system performs self-checks to insure the module is not damaged when
attempting to over-drive, however the overdrive protection is NOT SHORT CIRCUIT PROTECTED, and caution
must be taken to prevent damage to the board when driving into a short!